<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css-背景</title>

    <style>

         /*body {*/
         /*      background-image: url("../../pic/vector.png");*/
         /*      background-repeat: no-repeat;*/
         /*      !*背景拉伸*!*/
         /*}*/

         body {
              background-color: greenyellow;
         }
    </style>
</head>
<body>
ddd
</body>
</html>